Main.java Source code

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Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Tencent is pleased to support the open source community by making
 * Tencent GT (Version 2.4 and subsequent versions) available.
 *
 * Notwithstanding anything to the contrary herein, any previous version
 * of Tencent GT shall not be subject to the license hereunder.
 * All right, title, and interest, including all intellectual property rights,
 * in and to the previous version of Tencent GT (including any and all copies thereof)
 * shall be owned and retained by Tencent and subject to the license under the
 * Tencent GT End User License Agreement (http://gt.qq.com/wp-content/EULA_EN.html).
 * 
 * Copyright (C) 2015 THL A29 Limited, a Tencent company. All rights reserved.
 * 
 * Licensed under the MIT License (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of the License at
 * 
 * http://opensource.org/licenses/MIT
 * 
 * Unless required by applicable law or agreed to in writing, software distributed
 * under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
 * CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 */

import java.io.FileNotFoundException;

import java.io.IOException;

import java.io.RandomAccessFile;
import java.math.BigDecimal;

public class Main {
    public static double getCpuUsage1() {
        try {
            RandomAccessFile reader = new RandomAccessFile("/proc/stat", "r");
            String load = reader.readLine();
            String[] toks = load.split(" ");

            double user1 = Double.parseDouble(toks[2]);
            double system1 = Double.parseDouble(toks[4]);
            double irq1 = Double.parseDouble(toks[7]);
            double idle1 = Double.parseDouble(toks[5]);
            try {
                Thread.sleep(360);
            } catch (Exception e) {
                e.printStackTrace();
            }
            reader.seek(0);
            load = reader.readLine();
            reader.close();
            toks = load.split(" ");
            double user2 = Double.parseDouble(toks[2]);
            double system2 = Double.parseDouble(toks[4]);
            double irq2 = Double.parseDouble(toks[7]);
            double idle2 = Double.parseDouble(toks[5]);

            double user_pass = user2 - user1;
            double system_pass = system2 - system1;
            double irq_pass = irq2 - irq1;
            double idle_pass = idle2 - idle1;
            double usage = (user_pass + system_pass + irq_pass) * 100.00
                    / (user_pass + irq_pass + system_pass + idle_pass);
            BigDecimal b = new BigDecimal(usage);
            double res = b.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue();
            return res;
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e1) {
            e1.printStackTrace();
        }

        return 0;

    }
}